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1/*
2 * linux/fs/nfs/callback_proc.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback procedures
7 */
8#include <linux/nfs4.h>
9#include <linux/nfs_fs.h>
10#include <linux/slab.h>
11#include <linux/rcupdate.h>
12#include "nfs4_fs.h"
13#include "callback.h"
14#include "delegation.h"
15#include "internal.h"
16#include "pnfs.h"
17
18#ifdef NFS_DEBUG
19#define NFSDBG_FACILITY NFSDBG_CALLBACK
20#endif
21
22__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
23 struct cb_getattrres *res,
24 struct cb_process_state *cps)
25{
26 struct nfs_delegation *delegation;
27 struct nfs_inode *nfsi;
28 struct inode *inode;
29
30 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
31 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
32 goto out;
33
34 res->bitmap[0] = res->bitmap[1] = 0;
35 res->status = htonl(NFS4ERR_BADHANDLE);
36
37 dprintk_rcu("NFS: GETATTR callback request from %s\n",
38 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
39
40 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
41 if (inode == NULL)
42 goto out;
43 nfsi = NFS_I(inode);
44 rcu_read_lock();
45 delegation = rcu_dereference(nfsi->delegation);
46 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
47 goto out_iput;
48 res->size = i_size_read(inode);
49 res->change_attr = delegation->change_attr;
50 if (nfsi->npages != 0)
51 res->change_attr++;
52 res->ctime = inode->i_ctime;
53 res->mtime = inode->i_mtime;
54 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
55 args->bitmap[0];
56 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
57 args->bitmap[1];
58 res->status = 0;
59out_iput:
60 rcu_read_unlock();
61 iput(inode);
62out:
63 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
64 return res->status;
65}
66
67__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
68 struct cb_process_state *cps)
69{
70 struct inode *inode;
71 __be32 res;
72
73 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
74 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
75 goto out;
76
77 dprintk_rcu("NFS: RECALL callback request from %s\n",
78 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
79
80 res = htonl(NFS4ERR_BADHANDLE);
81 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
82 if (inode == NULL)
83 goto out;
84 /* Set up a helper thread to actually return the delegation */
85 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
86 case 0:
87 res = 0;
88 break;
89 case -ENOENT:
90 res = htonl(NFS4ERR_BAD_STATEID);
91 break;
92 default:
93 res = htonl(NFS4ERR_RESOURCE);
94 }
95 iput(inode);
96out:
97 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
98 return res;
99}
100
101#if defined(CONFIG_NFS_V4_1)
102
103/*
104 * Lookup a layout by filehandle.
105 *
106 * Note: gets a refcount on the layout hdr and on its respective inode.
107 * Caller must put the layout hdr and the inode.
108 *
109 * TODO: keep track of all layouts (and delegations) in a hash table
110 * hashed by filehandle.
111 */
112static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp, struct nfs_fh *fh)
113{
114 struct nfs_server *server;
115 struct inode *ino;
116 struct pnfs_layout_hdr *lo;
117
118 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
119 list_for_each_entry(lo, &server->layouts, plh_layouts) {
120 if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
121 continue;
122 ino = igrab(lo->plh_inode);
123 if (!ino)
124 continue;
125 get_layout_hdr(lo);
126 return lo;
127 }
128 }
129
130 return NULL;
131}
132
133static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp, struct nfs_fh *fh)
134{
135 struct pnfs_layout_hdr *lo;
136
137 spin_lock(&clp->cl_lock);
138 rcu_read_lock();
139 lo = get_layout_by_fh_locked(clp, fh);
140 rcu_read_unlock();
141 spin_unlock(&clp->cl_lock);
142
143 return lo;
144}
145
146static u32 initiate_file_draining(struct nfs_client *clp,
147 struct cb_layoutrecallargs *args)
148{
149 struct inode *ino;
150 struct pnfs_layout_hdr *lo;
151 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
152 LIST_HEAD(free_me_list);
153
154 lo = get_layout_by_fh(clp, &args->cbl_fh);
155 if (!lo)
156 return NFS4ERR_NOMATCHING_LAYOUT;
157
158 ino = lo->plh_inode;
159 spin_lock(&ino->i_lock);
160 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
161 mark_matching_lsegs_invalid(lo, &free_me_list,
162 &args->cbl_range))
163 rv = NFS4ERR_DELAY;
164 else
165 rv = NFS4ERR_NOMATCHING_LAYOUT;
166 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
167 spin_unlock(&ino->i_lock);
168 pnfs_free_lseg_list(&free_me_list);
169 put_layout_hdr(lo);
170 iput(ino);
171 return rv;
172}
173
174static u32 initiate_bulk_draining(struct nfs_client *clp,
175 struct cb_layoutrecallargs *args)
176{
177 struct nfs_server *server;
178 struct pnfs_layout_hdr *lo;
179 struct inode *ino;
180 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
181 struct pnfs_layout_hdr *tmp;
182 LIST_HEAD(recall_list);
183 LIST_HEAD(free_me_list);
184 struct pnfs_layout_range range = {
185 .iomode = IOMODE_ANY,
186 .offset = 0,
187 .length = NFS4_MAX_UINT64,
188 };
189
190 spin_lock(&clp->cl_lock);
191 rcu_read_lock();
192 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
193 if ((args->cbl_recall_type == RETURN_FSID) &&
194 memcmp(&server->fsid, &args->cbl_fsid,
195 sizeof(struct nfs_fsid)))
196 continue;
197
198 list_for_each_entry(lo, &server->layouts, plh_layouts) {
199 if (!igrab(lo->plh_inode))
200 continue;
201 get_layout_hdr(lo);
202 BUG_ON(!list_empty(&lo->plh_bulk_recall));
203 list_add(&lo->plh_bulk_recall, &recall_list);
204 }
205 }
206 rcu_read_unlock();
207 spin_unlock(&clp->cl_lock);
208
209 list_for_each_entry_safe(lo, tmp,
210 &recall_list, plh_bulk_recall) {
211 ino = lo->plh_inode;
212 spin_lock(&ino->i_lock);
213 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
214 if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
215 rv = NFS4ERR_DELAY;
216 list_del_init(&lo->plh_bulk_recall);
217 spin_unlock(&ino->i_lock);
218 pnfs_free_lseg_list(&free_me_list);
219 put_layout_hdr(lo);
220 iput(ino);
221 }
222 return rv;
223}
224
225static u32 do_callback_layoutrecall(struct nfs_client *clp,
226 struct cb_layoutrecallargs *args)
227{
228 u32 res;
229
230 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
231 if (args->cbl_recall_type == RETURN_FILE)
232 res = initiate_file_draining(clp, args);
233 else
234 res = initiate_bulk_draining(clp, args);
235 dprintk("%s returning %i\n", __func__, res);
236 return res;
237
238}
239
240__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
241 void *dummy, struct cb_process_state *cps)
242{
243 u32 res;
244
245 dprintk("%s: -->\n", __func__);
246
247 if (cps->clp)
248 res = do_callback_layoutrecall(cps->clp, args);
249 else
250 res = NFS4ERR_OP_NOT_IN_SESSION;
251
252 dprintk("%s: exit with status = %d\n", __func__, res);
253 return cpu_to_be32(res);
254}
255
256static void pnfs_recall_all_layouts(struct nfs_client *clp)
257{
258 struct cb_layoutrecallargs args;
259
260 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
261 memset(&args, 0, sizeof(args));
262 args.cbl_recall_type = RETURN_ALL;
263 /* FIXME we ignore errors, what should we do? */
264 do_callback_layoutrecall(clp, &args);
265}
266
267__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
268 void *dummy, struct cb_process_state *cps)
269{
270 int i;
271 __be32 res = 0;
272 struct nfs_client *clp = cps->clp;
273 struct nfs_server *server = NULL;
274
275 dprintk("%s: -->\n", __func__);
276
277 if (!clp) {
278 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
279 goto out;
280 }
281
282 for (i = 0; i < args->ndevs; i++) {
283 struct cb_devicenotifyitem *dev = &args->devs[i];
284
285 if (!server ||
286 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
287 rcu_read_lock();
288 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
289 if (server->pnfs_curr_ld &&
290 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
291 rcu_read_unlock();
292 goto found;
293 }
294 rcu_read_unlock();
295 dprintk("%s: layout type %u not found\n",
296 __func__, dev->cbd_layout_type);
297 continue;
298 }
299
300 found:
301 if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
302 dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
303 "deleting instead\n", __func__);
304 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
305 }
306
307out:
308 kfree(args->devs);
309 dprintk("%s: exit with status = %u\n",
310 __func__, be32_to_cpu(res));
311 return res;
312}
313
314/*
315 * Validate the sequenceID sent by the server.
316 * Return success if the sequenceID is one more than what we last saw on
317 * this slot, accounting for wraparound. Increments the slot's sequence.
318 *
319 * We don't yet implement a duplicate request cache, instead we set the
320 * back channel ca_maxresponsesize_cached to zero. This is OK for now
321 * since we only currently implement idempotent callbacks anyway.
322 *
323 * We have a single slot backchannel at this time, so we don't bother
324 * checking the used_slots bit array on the table. The lower layer guarantees
325 * a single outstanding callback request at a time.
326 */
327static __be32
328validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
329{
330 struct nfs4_slot *slot;
331
332 dprintk("%s enter. slotid %d seqid %d\n",
333 __func__, args->csa_slotid, args->csa_sequenceid);
334
335 if (args->csa_slotid >= NFS41_BC_MAX_CALLBACKS)
336 return htonl(NFS4ERR_BADSLOT);
337
338 slot = tbl->slots + args->csa_slotid;
339 dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
340
341 /* Normal */
342 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
343 slot->seq_nr++;
344 goto out_ok;
345 }
346
347 /* Replay */
348 if (args->csa_sequenceid == slot->seq_nr) {
349 dprintk("%s seqid %d is a replay\n",
350 __func__, args->csa_sequenceid);
351 /* Signal process_op to set this error on next op */
352 if (args->csa_cachethis == 0)
353 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
354
355 /* The ca_maxresponsesize_cached is 0 with no DRC */
356 else if (args->csa_cachethis == 1)
357 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
358 }
359
360 /* Wraparound */
361 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
362 slot->seq_nr = 1;
363 goto out_ok;
364 }
365
366 /* Misordered request */
367 return htonl(NFS4ERR_SEQ_MISORDERED);
368out_ok:
369 tbl->highest_used_slotid = args->csa_slotid;
370 return htonl(NFS4_OK);
371}
372
373/*
374 * For each referring call triple, check the session's slot table for
375 * a match. If the slot is in use and the sequence numbers match, the
376 * client is still waiting for a response to the original request.
377 */
378static bool referring_call_exists(struct nfs_client *clp,
379 uint32_t nrclists,
380 struct referring_call_list *rclists)
381{
382 bool status = 0;
383 int i, j;
384 struct nfs4_session *session;
385 struct nfs4_slot_table *tbl;
386 struct referring_call_list *rclist;
387 struct referring_call *ref;
388
389 /*
390 * XXX When client trunking is implemented, this becomes
391 * a session lookup from within the loop
392 */
393 session = clp->cl_session;
394 tbl = &session->fc_slot_table;
395
396 for (i = 0; i < nrclists; i++) {
397 rclist = &rclists[i];
398 if (memcmp(session->sess_id.data,
399 rclist->rcl_sessionid.data,
400 NFS4_MAX_SESSIONID_LEN) != 0)
401 continue;
402
403 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
404 ref = &rclist->rcl_refcalls[j];
405
406 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
407 "slotid %u\n", __func__,
408 ((u32 *)&rclist->rcl_sessionid.data)[0],
409 ((u32 *)&rclist->rcl_sessionid.data)[1],
410 ((u32 *)&rclist->rcl_sessionid.data)[2],
411 ((u32 *)&rclist->rcl_sessionid.data)[3],
412 ref->rc_sequenceid, ref->rc_slotid);
413
414 spin_lock(&tbl->slot_tbl_lock);
415 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
416 tbl->slots[ref->rc_slotid].seq_nr ==
417 ref->rc_sequenceid);
418 spin_unlock(&tbl->slot_tbl_lock);
419 if (status)
420 goto out;
421 }
422 }
423
424out:
425 return status;
426}
427
428__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
429 struct cb_sequenceres *res,
430 struct cb_process_state *cps)
431{
432 struct nfs4_slot_table *tbl;
433 struct nfs_client *clp;
434 int i;
435 __be32 status = htonl(NFS4ERR_BADSESSION);
436
437 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, &args->csa_sessionid);
438 if (clp == NULL)
439 goto out;
440
441 tbl = &clp->cl_session->bc_slot_table;
442
443 spin_lock(&tbl->slot_tbl_lock);
444 /* state manager is resetting the session */
445 if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
446 spin_unlock(&tbl->slot_tbl_lock);
447 status = htonl(NFS4ERR_DELAY);
448 /* Return NFS4ERR_BADSESSION if we're draining the session
449 * in order to reset it.
450 */
451 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
452 status = htonl(NFS4ERR_BADSESSION);
453 goto out;
454 }
455
456 status = validate_seqid(&clp->cl_session->bc_slot_table, args);
457 spin_unlock(&tbl->slot_tbl_lock);
458 if (status)
459 goto out;
460
461 cps->slotid = args->csa_slotid;
462
463 /*
464 * Check for pending referring calls. If a match is found, a
465 * related callback was received before the response to the original
466 * call.
467 */
468 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
469 status = htonl(NFS4ERR_DELAY);
470 goto out;
471 }
472
473 memcpy(&res->csr_sessionid, &args->csa_sessionid,
474 sizeof(res->csr_sessionid));
475 res->csr_sequenceid = args->csa_sequenceid;
476 res->csr_slotid = args->csa_slotid;
477 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
478 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
479
480out:
481 cps->clp = clp; /* put in nfs4_callback_compound */
482 for (i = 0; i < args->csa_nrclists; i++)
483 kfree(args->csa_rclists[i].rcl_refcalls);
484 kfree(args->csa_rclists);
485
486 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
487 cps->drc_status = status;
488 status = 0;
489 } else
490 res->csr_status = status;
491
492 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
493 ntohl(status), ntohl(res->csr_status));
494 return status;
495}
496
497static bool
498validate_bitmap_values(unsigned long mask)
499{
500 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
501}
502
503__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
504 struct cb_process_state *cps)
505{
506 __be32 status;
507 fmode_t flags = 0;
508
509 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
510 if (!cps->clp) /* set in cb_sequence */
511 goto out;
512
513 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
514 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
515
516 status = cpu_to_be32(NFS4ERR_INVAL);
517 if (!validate_bitmap_values(args->craa_type_mask))
518 goto out;
519
520 status = cpu_to_be32(NFS4_OK);
521 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
522 &args->craa_type_mask))
523 flags = FMODE_READ;
524 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
525 &args->craa_type_mask))
526 flags |= FMODE_WRITE;
527 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
528 &args->craa_type_mask))
529 pnfs_recall_all_layouts(cps->clp);
530 if (flags)
531 nfs_expire_all_delegation_types(cps->clp, flags);
532out:
533 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
534 return status;
535}
536
537/* Reduce the fore channel's max_slots to the target value */
538__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
539 struct cb_process_state *cps)
540{
541 struct nfs4_slot_table *fc_tbl;
542 __be32 status;
543
544 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
545 if (!cps->clp) /* set in cb_sequence */
546 goto out;
547
548 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
549 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
550 args->crsa_target_max_slots);
551
552 fc_tbl = &cps->clp->cl_session->fc_slot_table;
553
554 status = htonl(NFS4ERR_BAD_HIGH_SLOT);
555 if (args->crsa_target_max_slots > fc_tbl->max_slots ||
556 args->crsa_target_max_slots < 1)
557 goto out;
558
559 status = htonl(NFS4_OK);
560 if (args->crsa_target_max_slots == fc_tbl->max_slots)
561 goto out;
562
563 fc_tbl->target_max_slots = args->crsa_target_max_slots;
564 nfs41_handle_recall_slot(cps->clp);
565out:
566 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
567 return status;
568}
569#endif /* CONFIG_NFS_V4_1 */
1/*
2 * linux/fs/nfs/callback_proc.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback procedures
7 */
8#include <linux/nfs4.h>
9#include <linux/nfs_fs.h>
10#include <linux/slab.h>
11#include <linux/rcupdate.h>
12#include "nfs4_fs.h"
13#include "callback.h"
14#include "delegation.h"
15#include "internal.h"
16#include "pnfs.h"
17#include "nfs4session.h"
18#include "nfs4trace.h"
19
20#ifdef NFS_DEBUG
21#define NFSDBG_FACILITY NFSDBG_CALLBACK
22#endif
23
24__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
25 struct cb_getattrres *res,
26 struct cb_process_state *cps)
27{
28 struct nfs_delegation *delegation;
29 struct nfs_inode *nfsi;
30 struct inode *inode;
31
32 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
33 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
34 goto out;
35
36 res->bitmap[0] = res->bitmap[1] = 0;
37 res->status = htonl(NFS4ERR_BADHANDLE);
38
39 dprintk_rcu("NFS: GETATTR callback request from %s\n",
40 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
41
42 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
43 if (inode == NULL)
44 goto out;
45 nfsi = NFS_I(inode);
46 rcu_read_lock();
47 delegation = rcu_dereference(nfsi->delegation);
48 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
49 goto out_iput;
50 res->size = i_size_read(inode);
51 res->change_attr = delegation->change_attr;
52 if (nfsi->npages != 0)
53 res->change_attr++;
54 res->ctime = inode->i_ctime;
55 res->mtime = inode->i_mtime;
56 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
57 args->bitmap[0];
58 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
59 args->bitmap[1];
60 res->status = 0;
61out_iput:
62 rcu_read_unlock();
63 iput(inode);
64out:
65 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
66 return res->status;
67}
68
69__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
70 struct cb_process_state *cps)
71{
72 struct inode *inode;
73 __be32 res;
74
75 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
76 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
77 goto out;
78
79 dprintk_rcu("NFS: RECALL callback request from %s\n",
80 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
81
82 res = htonl(NFS4ERR_BADHANDLE);
83 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
84 if (inode == NULL)
85 goto out;
86 /* Set up a helper thread to actually return the delegation */
87 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
88 case 0:
89 res = 0;
90 break;
91 case -ENOENT:
92 res = htonl(NFS4ERR_BAD_STATEID);
93 break;
94 default:
95 res = htonl(NFS4ERR_RESOURCE);
96 }
97 trace_nfs4_recall_delegation(inode, -ntohl(res));
98 iput(inode);
99out:
100 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
101 return res;
102}
103
104#if defined(CONFIG_NFS_V4_1)
105
106/*
107 * Lookup a layout by filehandle.
108 *
109 * Note: gets a refcount on the layout hdr and on its respective inode.
110 * Caller must put the layout hdr and the inode.
111 *
112 * TODO: keep track of all layouts (and delegations) in a hash table
113 * hashed by filehandle.
114 */
115static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp,
116 struct nfs_fh *fh, nfs4_stateid *stateid)
117{
118 struct nfs_server *server;
119 struct inode *ino;
120 struct pnfs_layout_hdr *lo;
121
122 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
123 list_for_each_entry(lo, &server->layouts, plh_layouts) {
124 if (!nfs4_stateid_match_other(&lo->plh_stateid, stateid))
125 continue;
126 if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
127 continue;
128 ino = igrab(lo->plh_inode);
129 if (!ino)
130 break;
131 spin_lock(&ino->i_lock);
132 /* Is this layout in the process of being freed? */
133 if (NFS_I(ino)->layout != lo) {
134 spin_unlock(&ino->i_lock);
135 iput(ino);
136 break;
137 }
138 pnfs_get_layout_hdr(lo);
139 spin_unlock(&ino->i_lock);
140 return lo;
141 }
142 }
143
144 return NULL;
145}
146
147static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp,
148 struct nfs_fh *fh, nfs4_stateid *stateid)
149{
150 struct pnfs_layout_hdr *lo;
151
152 spin_lock(&clp->cl_lock);
153 rcu_read_lock();
154 lo = get_layout_by_fh_locked(clp, fh, stateid);
155 rcu_read_unlock();
156 spin_unlock(&clp->cl_lock);
157
158 return lo;
159}
160
161static u32 initiate_file_draining(struct nfs_client *clp,
162 struct cb_layoutrecallargs *args)
163{
164 struct inode *ino;
165 struct pnfs_layout_hdr *lo;
166 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
167 LIST_HEAD(free_me_list);
168
169 lo = get_layout_by_fh(clp, &args->cbl_fh, &args->cbl_stateid);
170 if (!lo)
171 goto out;
172
173 ino = lo->plh_inode;
174 spin_lock(&ino->i_lock);
175 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
176 pnfs_mark_matching_lsegs_invalid(lo, &free_me_list,
177 &args->cbl_range))
178 rv = NFS4ERR_DELAY;
179 else
180 rv = NFS4ERR_NOMATCHING_LAYOUT;
181 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
182 spin_unlock(&ino->i_lock);
183 pnfs_free_lseg_list(&free_me_list);
184 pnfs_put_layout_hdr(lo);
185 iput(ino);
186out:
187 return rv;
188}
189
190static u32 initiate_bulk_draining(struct nfs_client *clp,
191 struct cb_layoutrecallargs *args)
192{
193 int stat;
194
195 if (args->cbl_recall_type == RETURN_FSID)
196 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
197 else
198 stat = pnfs_destroy_layouts_byclid(clp, true);
199 if (stat != 0)
200 return NFS4ERR_DELAY;
201 return NFS4ERR_NOMATCHING_LAYOUT;
202}
203
204static u32 do_callback_layoutrecall(struct nfs_client *clp,
205 struct cb_layoutrecallargs *args)
206{
207 u32 res;
208
209 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
210 if (args->cbl_recall_type == RETURN_FILE)
211 res = initiate_file_draining(clp, args);
212 else
213 res = initiate_bulk_draining(clp, args);
214 dprintk("%s returning %i\n", __func__, res);
215 return res;
216
217}
218
219__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
220 void *dummy, struct cb_process_state *cps)
221{
222 u32 res;
223
224 dprintk("%s: -->\n", __func__);
225
226 if (cps->clp)
227 res = do_callback_layoutrecall(cps->clp, args);
228 else
229 res = NFS4ERR_OP_NOT_IN_SESSION;
230
231 dprintk("%s: exit with status = %d\n", __func__, res);
232 return cpu_to_be32(res);
233}
234
235static void pnfs_recall_all_layouts(struct nfs_client *clp)
236{
237 struct cb_layoutrecallargs args;
238
239 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
240 memset(&args, 0, sizeof(args));
241 args.cbl_recall_type = RETURN_ALL;
242 /* FIXME we ignore errors, what should we do? */
243 do_callback_layoutrecall(clp, &args);
244}
245
246__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
247 void *dummy, struct cb_process_state *cps)
248{
249 int i;
250 __be32 res = 0;
251 struct nfs_client *clp = cps->clp;
252 struct nfs_server *server = NULL;
253
254 dprintk("%s: -->\n", __func__);
255
256 if (!clp) {
257 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
258 goto out;
259 }
260
261 for (i = 0; i < args->ndevs; i++) {
262 struct cb_devicenotifyitem *dev = &args->devs[i];
263
264 if (!server ||
265 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
266 rcu_read_lock();
267 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
268 if (server->pnfs_curr_ld &&
269 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
270 rcu_read_unlock();
271 goto found;
272 }
273 rcu_read_unlock();
274 dprintk("%s: layout type %u not found\n",
275 __func__, dev->cbd_layout_type);
276 continue;
277 }
278
279 found:
280 if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
281 dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
282 "deleting instead\n", __func__);
283 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
284 }
285
286out:
287 kfree(args->devs);
288 dprintk("%s: exit with status = %u\n",
289 __func__, be32_to_cpu(res));
290 return res;
291}
292
293/*
294 * Validate the sequenceID sent by the server.
295 * Return success if the sequenceID is one more than what we last saw on
296 * this slot, accounting for wraparound. Increments the slot's sequence.
297 *
298 * We don't yet implement a duplicate request cache, instead we set the
299 * back channel ca_maxresponsesize_cached to zero. This is OK for now
300 * since we only currently implement idempotent callbacks anyway.
301 *
302 * We have a single slot backchannel at this time, so we don't bother
303 * checking the used_slots bit array on the table. The lower layer guarantees
304 * a single outstanding callback request at a time.
305 */
306static __be32
307validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
308{
309 struct nfs4_slot *slot;
310
311 dprintk("%s enter. slotid %u seqid %u\n",
312 __func__, args->csa_slotid, args->csa_sequenceid);
313
314 if (args->csa_slotid >= NFS41_BC_MAX_CALLBACKS)
315 return htonl(NFS4ERR_BADSLOT);
316
317 slot = tbl->slots + args->csa_slotid;
318 dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr);
319
320 /* Normal */
321 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
322 slot->seq_nr++;
323 goto out_ok;
324 }
325
326 /* Replay */
327 if (args->csa_sequenceid == slot->seq_nr) {
328 dprintk("%s seqid %u is a replay\n",
329 __func__, args->csa_sequenceid);
330 /* Signal process_op to set this error on next op */
331 if (args->csa_cachethis == 0)
332 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
333
334 /* The ca_maxresponsesize_cached is 0 with no DRC */
335 else if (args->csa_cachethis == 1)
336 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
337 }
338
339 /* Wraparound */
340 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
341 slot->seq_nr = 1;
342 goto out_ok;
343 }
344
345 /* Misordered request */
346 return htonl(NFS4ERR_SEQ_MISORDERED);
347out_ok:
348 tbl->highest_used_slotid = args->csa_slotid;
349 return htonl(NFS4_OK);
350}
351
352/*
353 * For each referring call triple, check the session's slot table for
354 * a match. If the slot is in use and the sequence numbers match, the
355 * client is still waiting for a response to the original request.
356 */
357static bool referring_call_exists(struct nfs_client *clp,
358 uint32_t nrclists,
359 struct referring_call_list *rclists)
360{
361 bool status = 0;
362 int i, j;
363 struct nfs4_session *session;
364 struct nfs4_slot_table *tbl;
365 struct referring_call_list *rclist;
366 struct referring_call *ref;
367
368 /*
369 * XXX When client trunking is implemented, this becomes
370 * a session lookup from within the loop
371 */
372 session = clp->cl_session;
373 tbl = &session->fc_slot_table;
374
375 for (i = 0; i < nrclists; i++) {
376 rclist = &rclists[i];
377 if (memcmp(session->sess_id.data,
378 rclist->rcl_sessionid.data,
379 NFS4_MAX_SESSIONID_LEN) != 0)
380 continue;
381
382 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
383 ref = &rclist->rcl_refcalls[j];
384
385 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
386 "slotid %u\n", __func__,
387 ((u32 *)&rclist->rcl_sessionid.data)[0],
388 ((u32 *)&rclist->rcl_sessionid.data)[1],
389 ((u32 *)&rclist->rcl_sessionid.data)[2],
390 ((u32 *)&rclist->rcl_sessionid.data)[3],
391 ref->rc_sequenceid, ref->rc_slotid);
392
393 spin_lock(&tbl->slot_tbl_lock);
394 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
395 tbl->slots[ref->rc_slotid].seq_nr ==
396 ref->rc_sequenceid);
397 spin_unlock(&tbl->slot_tbl_lock);
398 if (status)
399 goto out;
400 }
401 }
402
403out:
404 return status;
405}
406
407__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
408 struct cb_sequenceres *res,
409 struct cb_process_state *cps)
410{
411 struct nfs4_slot_table *tbl;
412 struct nfs_client *clp;
413 int i;
414 __be32 status = htonl(NFS4ERR_BADSESSION);
415
416 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
417 &args->csa_sessionid, cps->minorversion);
418 if (clp == NULL)
419 goto out;
420
421 tbl = &clp->cl_session->bc_slot_table;
422
423 spin_lock(&tbl->slot_tbl_lock);
424 /* state manager is resetting the session */
425 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
426 spin_unlock(&tbl->slot_tbl_lock);
427 status = htonl(NFS4ERR_DELAY);
428 /* Return NFS4ERR_BADSESSION if we're draining the session
429 * in order to reset it.
430 */
431 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
432 status = htonl(NFS4ERR_BADSESSION);
433 goto out;
434 }
435
436 status = validate_seqid(&clp->cl_session->bc_slot_table, args);
437 spin_unlock(&tbl->slot_tbl_lock);
438 if (status)
439 goto out;
440
441 cps->slotid = args->csa_slotid;
442
443 /*
444 * Check for pending referring calls. If a match is found, a
445 * related callback was received before the response to the original
446 * call.
447 */
448 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
449 status = htonl(NFS4ERR_DELAY);
450 goto out;
451 }
452
453 memcpy(&res->csr_sessionid, &args->csa_sessionid,
454 sizeof(res->csr_sessionid));
455 res->csr_sequenceid = args->csa_sequenceid;
456 res->csr_slotid = args->csa_slotid;
457 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
458 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
459
460out:
461 cps->clp = clp; /* put in nfs4_callback_compound */
462 for (i = 0; i < args->csa_nrclists; i++)
463 kfree(args->csa_rclists[i].rcl_refcalls);
464 kfree(args->csa_rclists);
465
466 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
467 cps->drc_status = status;
468 status = 0;
469 } else
470 res->csr_status = status;
471
472 trace_nfs4_cb_sequence(args, res, status);
473 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
474 ntohl(status), ntohl(res->csr_status));
475 return status;
476}
477
478static bool
479validate_bitmap_values(unsigned long mask)
480{
481 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
482}
483
484__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
485 struct cb_process_state *cps)
486{
487 __be32 status;
488 fmode_t flags = 0;
489
490 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
491 if (!cps->clp) /* set in cb_sequence */
492 goto out;
493
494 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
495 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
496
497 status = cpu_to_be32(NFS4ERR_INVAL);
498 if (!validate_bitmap_values(args->craa_type_mask))
499 goto out;
500
501 status = cpu_to_be32(NFS4_OK);
502 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
503 &args->craa_type_mask))
504 flags = FMODE_READ;
505 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
506 &args->craa_type_mask))
507 flags |= FMODE_WRITE;
508 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
509 &args->craa_type_mask))
510 pnfs_recall_all_layouts(cps->clp);
511 if (flags)
512 nfs_expire_unused_delegation_types(cps->clp, flags);
513out:
514 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
515 return status;
516}
517
518/* Reduce the fore channel's max_slots to the target value */
519__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
520 struct cb_process_state *cps)
521{
522 struct nfs4_slot_table *fc_tbl;
523 __be32 status;
524
525 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
526 if (!cps->clp) /* set in cb_sequence */
527 goto out;
528
529 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
530 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
531 args->crsa_target_highest_slotid);
532
533 fc_tbl = &cps->clp->cl_session->fc_slot_table;
534
535 status = htonl(NFS4_OK);
536
537 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
538 nfs41_server_notify_target_slotid_update(cps->clp);
539out:
540 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
541 return status;
542}
543#endif /* CONFIG_NFS_V4_1 */